Thread: K3 using serial port problem
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Old 06-05-2012, 01:36 PM   #39
knc1
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Posts: 17,212
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Join Date: Feb 2012
Location: Central Texas
Device: No K1, PW2, KV, KOA
Quote:
Originally Posted by BusterBrown View Post
I am using Linux Mint 12 and have the Sparkfun level converter, Max 232, U232-P9 USB to serial and getting 1.8 volt supply from the Kindle serial port.
That is a CMOS input signal that controls the lamp power to the upper connector. You can't pull enough power from its pull-up resistor to power your level converter.
I.E: Once the SoC gets re-configured by the kernel in its startup process, you are losing power to the level converter.

Re-option your level converter to be powered by the USB side.

The minicom options all look reasonable (both hardware and software flow control disabled).
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